Three-dimensional inhomogeneities in PEDOT:PSS films

被引：173
作者：
Kemerink, M
Timpanaro, S
de Kok, MM
Meulenkamp, EA
Touwslager, FJ
机构：
[1] Eindhoven Univ Technol, Dept Appl Phys, NL-5600 MB Eindhoven, Netherlands
[2] Philips Res Labs, NL-5656 AA Eindhoven, Netherlands
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 49期
关键词：
D O I：
10.1021/jp0464674
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Spin-cast PEDOT/PSS film are investigated using scanning probe-based spectroscopic techniques. The films are found to consist of relatively well-conducting islands that are embedded in a less conductive matrix. A scanning-tunneling microscope-based method is developed to obtain three-dimensional conductivity images with nanometer resolution. Order-of-magnitude variations in the film conductivity are observed in all spatial directions. In addition, charge transport in the normal direction depends on the injection spot and is found to be ohmic or space-charge-limited. We found that both the morphology and the conductivity of the top layer differ substantially from those in the bulk, which is attributed to an enhanced PSS content in the top layer.
引用
收藏
页码：18820 / 18825
页数：6
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